WATCHES: Severe Thunderstorm Watch Number 552

WWUS20 KWNS 052203
SEL2
SPC WW 052203
LAZ000-TXZ000-060300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 552
NWS STORM PREDICTION CENTER NORMAN OK
500 PM CDT SUN JUL 5 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

NORTHWESTERN LOUISIANA
EAST CENTRAL TEXAS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 500 PM UNTIL
1000 PM CDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH OF
TYLER TEXAS TO 45 MILES SOUTH SOUTHEAST OF SHREVEPORT LOUISIANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 550...WW 551...

DISCUSSION...INTENSE STORMS HAD RECENTLY DEVELOPED ALONG
INTERSECTION OF TWO OUTFLOW BOUNDARIES...ABOUT 35 SOUTHWEST OF TYR.
THESE STORMS ARE LIKELY TO REMAIN STRONG INTO THE EVENING HOURS AS
THEY SHIFT ESEWD ALONG OUTFLOW BOUNDARY THAT EXTENDS SEWD FROM THE
STORMS TO NORTH OF POE. STRONG INSTABILITY...HIGH PRECIPITABLE WATER
VALUES AND TEMPERATURES NEAR 100 DEGREES...ON THE SOUTH SIDE OF THE
BOUNDARY...ARE LIKELY TO SUPPORT A WIND THREAT WITH THESE STORMS.
ALSO...OTHER SEVERE STORMS ARE POSSIBLE ACROSS PORTIONS OF ERN
TX/NWRN LA IN VERY MOIST AIR MASS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
MOTION VECTOR 29020.

...IMY

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